1; Test 16-bit byteswaps from memory to registers.
2;
3; RUN: llc < %s -mtriple=s390x-linux-gnu | FileCheck %s
4
5declare i16 @llvm.bswap.i16(i16 %a)
6
7; Check LRVH with no displacement.
8define i16 @f1(i16 *%src) {
9; CHECK-LABEL: f1:
10; CHECK: lrvh %r2, 0(%r2)
11; CHECK: br %r14
12  %a = load i16 , i16 *%src
13  %swapped = call i16 @llvm.bswap.i16(i16 %a)
14  ret i16 %swapped
15}
16
17; Check the high end of the aligned LRVH range.
18define i16 @f2(i16 *%src) {
19; CHECK-LABEL: f2:
20; CHECK: lrvh %r2, 524286(%r2)
21; CHECK: br %r14
22  %ptr = getelementptr i16, i16 *%src, i64 262143
23  %a = load i16 , i16 *%ptr
24  %swapped = call i16 @llvm.bswap.i16(i16 %a)
25  ret i16 %swapped
26}
27
28; Check the next word up, which needs separate address logic.
29; Other sequences besides this one would be OK.
30define i16 @f3(i16 *%src) {
31; CHECK-LABEL: f3:
32; CHECK: agfi %r2, 524288
33; CHECK: lrvh %r2, 0(%r2)
34; CHECK: br %r14
35  %ptr = getelementptr i16, i16 *%src, i64 262144
36  %a = load i16 , i16 *%ptr
37  %swapped = call i16 @llvm.bswap.i16(i16 %a)
38  ret i16 %swapped
39}
40
41; Check the high end of the negative aligned LRVH range.
42define i16 @f4(i16 *%src) {
43; CHECK-LABEL: f4:
44; CHECK: lrvh %r2, -2(%r2)
45; CHECK: br %r14
46  %ptr = getelementptr i16, i16 *%src, i64 -1
47  %a = load i16 , i16 *%ptr
48  %swapped = call i16 @llvm.bswap.i16(i16 %a)
49  ret i16 %swapped
50}
51
52; Check the low end of the LRVH range.
53define i16 @f5(i16 *%src) {
54; CHECK-LABEL: f5:
55; CHECK: lrvh %r2, -524288(%r2)
56; CHECK: br %r14
57  %ptr = getelementptr i16, i16 *%src, i64 -262144
58  %a = load i16 , i16 *%ptr
59  %swapped = call i16 @llvm.bswap.i16(i16 %a)
60  ret i16 %swapped
61}
62
63; Check the next word down, which needs separate address logic.
64; Other sequences besides this one would be OK.
65define i16 @f6(i16 *%src) {
66; CHECK-LABEL: f6:
67; CHECK: agfi %r2, -524290
68; CHECK: lrvh %r2, 0(%r2)
69; CHECK: br %r14
70  %ptr = getelementptr i16, i16 *%src, i64 -262145
71  %a = load i16 , i16 *%ptr
72  %swapped = call i16 @llvm.bswap.i16(i16 %a)
73  ret i16 %swapped
74}
75
76; Check that LRVH allows an index.
77define i16 @f7(i64 %src, i64 %index) {
78; CHECK-LABEL: f7:
79; CHECK: lrvh %r2, 524287({{%r3,%r2|%r2,%r3}})
80; CHECK: br %r14
81  %add1 = add i64 %src, %index
82  %add2 = add i64 %add1, 524287
83  %ptr = inttoptr i64 %add2 to i16 *
84  %a = load i16 , i16 *%ptr
85  %swapped = call i16 @llvm.bswap.i16(i16 %a)
86  ret i16 %swapped
87}
88
89; Check that volatile accesses do not use LRVH, which might access the
90; storage multple times.
91define i16 @f8(i16 *%src) {
92; CHECK-LABEL: f8:
93; CHECK: lh [[REG:%r[0-5]]], 0(%r2)
94; CHECK: lrvr %r2, [[REG]]
95; CHECK: br %r14
96  %a = load volatile i16 , i16 *%src
97  %swapped = call i16 @llvm.bswap.i16(i16 %a)
98  ret i16 %swapped
99}
100